J. N. Wilson1, P. H. Regan2,3 ,G. Georgiev4, I. Matea1, D. Verney1, M

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Presentation transcript:

A hybrid LaBr3-Ge array for fast timing spectroscopic studies at the IPN Orsay J.N. Wilson1, P.H.Regan2,3 ,G. Georgiev4, I. Matea1, D. Verney1, M. Lebois1, P. Halipre1, L. Qi1, A. Gottardo1, J. Ljungvall4, Zs.Podolyak2, S.M.Judge2,3, R. Shearman2,3, R. Carroll2, M. Rudigier2, A.Pearce3, G.Lorusso2,3, A.M. Bruce5, N. Marginean6, T. Kroell7, S. Ilieva7, A. Ignatov7, G. Fernandez7, V. Werner7, L.M. Fraile8, V. Vedia8, J. Jolie9, J.M. Regis9, W. Korten10, J.F. Smith11, P.M. McKee11, E. Parr11, M. Smolen11, S.Lalkovski2,12,S. Kisyov12, A. Görgen13, S.Siem13, K. Hadynska-Klek 13, E. Sahin13A. Oberstedt1,14, G. Smith15,R. Lozeva16,S. Oberstedt17 1Institut de Physique Nucléaire Orsay ,France 2Department of Physics, University of Surrey, UK 3National Physical Laboratory,Teddington, UK 4CSNSM Orsay, France 5University of Brighton, UK 6IFIN-HH. Maguerele, Bucharest, Romania 7TU Darmstadt, Germany 8U. Complutense, Madrid, Spain 9IFK- Köln, Germany 10CEA Saclay, France 11Universiyt of West of Scotland, Paisley, UK 12 University of Sofia, Bulgaria 13 University of Oslo, Norway 14 Chalmers University, Sweden 15 University of Manchester, UK 16 IPHC Strasbourg, France 17European Commission JRC-IRM, Geel, Belgium

The ALTO facility of the IPN Orsay

the ALTO facility beams Nuclear Reactions: Bacchus Nuclear Astrophysics: Split-Pole ISOL beams: b-decay LASER spectroscopy… g Spectroscopy: ORGAM Clusters

IPN Orsay ALTO facility 15 MV tandem accelerator Diverse beams from protons to heavy ions (e.g. 127I) Beams of 48Ca and 14C available Atomic clusters (e.g. C60)

ORGAM @ ALTO, IPN ORSAY

The ROSPHERE Gamma-ray Spectrometer array (at IFIN-HH Bucharest) 14 HPGe detectors (AC) are used to detect coincident γ rays: 7x HPGe dets. @ 37o 4x HPGe dets. @ 64o 3x HPGe dets. @ 90o 11 LaBr3(Ce:5%) detectors 7x ø2”x2” and 4x ø1.5”x2” (Cylindrical) @ 37, 64 and 90o w.r.t. the beam axis.

Neutron production in inverse kinematics Sample H target γ n n n 100nA 7Li 13-17 MeV n γ Lithium Inverse Cinematiques ORsay NEutron source p(7Li,7Be)n reaction in inverse kinematics Focused source of fast neutrons between 0.5 and 4 MeV

LICORNE II H2 pressure and low control system Hydrogen gas cells

Neutron supression at 90 degrees 1.5 m H target n n n NE213 100nA 7Li 17 MeV n 1.5 m

107 n/s/cm2 LICORNE FLUXES 0.5 < En < 2.6 MeV ~ 90 kHz fission rate for 30g 238U sample

Miniball data set: ~ 5 x 109 Mγ >= 3 events in two weeks

Prompt peak 400 ns

Fission Fragment Isomers (10ns - 10µs) dimanche 11 novembre 2018dimanche 11 novembre 2018

dimanche 11 novembre 2018dimanche 11 novembre 2018 149Pm

dimanche 11 novembre 2018dimanche 11 novembre 2018 149Pmm 87,88,89Ga

dimanche 11 novembre 2018dimanche 11 novembre 2018

TIPS – Tagging Isomer PartnerS dimanche 11 novembre 2018dimanche 11 novembre 2018 TIPS – Tagging Isomer PartnerS

Prompt peak 400 ns

T1/2 ~ 170ns

138Ba 0.8μs Isomer * * * New Isomer in 138Ba?

138Ba Partners 96Kr 98Kr To be continued…

Experimental Setup: Energy dependence of prompt-g emission. July 2013

Multiplicity Versus Energy Discrimination: 60Co

Multiplicity Versus Energy Discrimination: 252Cf FISSION events (n,n’) Intrisic activity

Prompt Fission GAMMA from 252Cf USING THE BaF2 CALORIMETER

Ge-LaBr3 hybrid array + LICORNE 238U(n,f) or 232Th(n,f) reactions to study neutron rich fission fragments Cold fission (En ~ 1.5 MeV or En ~ 2.5 MeV with 11B beam) Lifetime measurements in hundreds of exotic nuclei Excellent selectivity of fission fragments and their partners via isoler tagging from 1 – 50ns Calorimeter (Ω > 50%) + beam buncher would allow very clean multiplicity/sum-energy tag on fission events

A hybrid LaBr3-Ge array for fast timing spectroscopic studies ν-ball A hybrid LaBr3-Ge array for fast timing spectroscopic studies at the IPN Orsay Detectors: ~20 Ge (Gamma pool + loan pool Orsay) and/or others (max ~64) Minimum 36 LaBr3 guaranteed by FATIMA collaboration (max ~50) Mechanics: Use/fusion of exisiting mechanical structure(s) whenever possible Electronics: Needs investment in dedicated digital DAQ (fast timing + high energy resolution) Time Frame: First experiments mid-to-late 2016 Campaign Duration: ~6 Months Workshop to be held at the end of 2015 to discuss physics cases

LICORNE Inverse Kinematics Curves

238U(n,f) physics cases using LICORNE + Miniball dimanche 11 novembre 2018dimanche 11 novembre 2018 Neutron-rich nuclei around and beyond 132Sn (R. Lozeva) Spectroscopy of neutron-rich fragments of 40<Z<50 (A. Gottardo) Shape coexistence and collectivity around N=60 (M. Zielinska) Evolution and collectivity development in the vicinity of 78Ni (D. Verney)